Engineering online and in-person social networks to sustain physical activity: application of a conceptual model
Liza S Rovniak*, James F Sallis, Jennifer L Kraschnewski, Christopher N Sciamanna, Elizabeth J Kiser, Chester A Ray, Vernon M Chinchilli, Ding Ding, Stephen A Matthews, Melissa Bopp, Daniel R George and Melbourne F Hovell
BMC Public Health 2013, 13:753
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